Lockheed Martin Transaction (Integration Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Business Acquisition [Line Items]
Total acquisition and integration costs	$ 15	$ 0	$ 24	$ 0
Lockheed Martin Merger
Business Acquisition [Line Items]
Strategic acquisition and integration advisory services	7		10
Legal and accounting services	5		10
Other integration costs	3		4
Total acquisition and integration costs	$ 15		$ 24